The document discusses the benefits of implementing a data warehouse. It states that a data warehouse integrates data from multiple sources for analysis and reporting without impacting transactional systems. It provides benefits such as enhanced business intelligence through improved access to insights and data-driven decision making, increased query and system performance through optimized data storage and retrieval, access to data from multiple sources through data integration, timely access to data through scheduled data loading processes, enhanced data quality and consistency through data standardization, access to historical data for trend analysis, and high returns on investment through increased revenues and cost savings.

1. NADAR SARASWATHI COLLEGE OF ARTS
AND SCIENCE
SUBMITTED BY
S.VIJAYALAKSHMI.

2. Data warehouse
 Data warehouses (DW) are centralized data repositories that integrate
data from various transactional, legacy, or external systems,
applications, and sources.
 The data warehouse provides an environment separate from the
operational systems and is completely designed for decision-support,
analytical-reporting, ad-hoc queries, and data mining.
 This isolation and optimization enables queries to be performed
without any impact on the systems that support the business’ primary
transactions.

3.  Fundamentally, a data warehouse helps solve the on-going problem of
pulling data out of transactional systems quickly and efficiently and
converting that data into actionable information.

4.  Additionally, the data warehouse allows for processing of large and
complex queries in a highly-efficient manner.
 Upon successful implementation of a data warehouse or data mart,
business will realize numerous improvements and
positive gains.

5. Benefits from a successful implementation of a data warehouse
include:
 Enhanced Business Intelligence
 Increased Query and System Performance
 Business Intelligence from Multiple Sources
 Timely Access to Data
 Enhanced Data Quality and Consistency
 Historical Intelligence
 High Return on Investment

6. Enchanced business intelligence:
 Insights will be gained through improved information access.
 Managers and executives will be freed from making their decisions
based on limited data and their own “gut feelings”.
 Decisions that affect the strategy and operations of organizations will
be based upon credible facts and will be backed up with evidence
and actual organizational data.
 Moreover, decision makers will be better informed as they will be
able to query actual data will retrieve information based upon their
personal needs.
 In addition, data warehouses and related business intelligence can be
used to can be applied directly to business processes including
marketing segmentation, inventory management, financial
management, and sales.

7. Increased system and query performance:
 Data warehouses are purposely designed and constructed with
a focus on speed of data retrieval and analysis.
 Moreover, a data warehouse is designed for storing large volumes of
data and being able to rapidly query the data.
 These analtical systems are constructed differently from operational
systems which focus on creation and modification of data.
 In contrast, the data warehouse is built for analysis and retrieval of
data rather than efficient upkeep of individual records.
 Further, the data warehouse allows for a large system burden to be
taken off the operational environment and effectively distributes
system load across an entire organization’s technology infrastructure.

8. Business intelligence from multiple sources:
 For many organizations, enterprise information systems are comprised
of multiple subsystems, physically separated and built on different
platforms.
 Moreover, merging data from multiple disparate data sources is a
common need when conducting business intelligence.
 To solve this problem, the data warehouse performs integration of
existing disparate data sources and makes them accessible in one
place.
 Consolidating enterprise data into a single data repository alleviates
the burden of duplicating data gathering efforts, and enables the
extraction of information that would otherwise be impossible.
 Additionally, the data warehouse becomes the “single view of truth”
for the enterprise rather than the multiple truths that can come from
reporting on individual subsystems.

9. Timely access data:
 The data warehouse enables business users and decision makers to
have access to data from many different sources as they need to have
access to the data.
 Additionally, business users will spend little time in the data retrieval
process. Scheduled data integration routines, known as ETL, are
leveraged within a data warehouse environment.
 These routines consolidate data from multiple source systems and
transform the data into a useful format.
 Subsequently, business users can then easily access data from one
interface. Further, consumers of data will be able to query data directly
with less information technology support.

10.  The wait time for information technology professionals to develop
reports and queries is greatly diminished as the business users are
given the ability to generate reports and queries on their own.
 The use of query and analysis tools against a consistent and
consolidated data repository enables business users to spend more
time performing data analysis and less time gathering data.

11. Enhanced data quality and consistency:
 A data warehouse implementation typically includes the conversion
of data from numerous source systems and data files and
transformation of the disparate data into a common format.
 Data from the various business units and departments is standardized
and the inconsistent nature of data from the unique source systems is
removed.
 Moreover, individual business units and departments including sales,
marketing, finance, and operations, will start to utilize the same data
repository as the source system for their individual queries and
reports.

12.  The wait time for information technology professionals to
develop reports and queries is greatly diminished as the business
users are given the ability to generate reports and queries on their
own.
 The use of query and analysis tools against a consistent and
consolidated data repository enables business users to spend
more time performing data analysis and less time gathering data.

13. Historical intelligence:
 Data warehouses generally contain many years worth of data that can
neither be stored within nor reported from a transactional system.
 Typically transactional systems satisfy most operating reporting
requirements for a given time-period but without the inclusion of
historical data.
 In contrast, the data warehouse stores large amounts of historical data
and can enable advanced business intelligence including time-period
analysis, trend analysis, and trend prediction.
 The advantage of the data warehouse is that it allows for advanced
reporting and analysis of multiple time-periods.

14. High return on investment:
 Return on investment (ROI) refers to the amount of increased revenue
or decreased expenses a business will be able to realize from any
project or investment of capital.
 Subsequently, implementations of data warehouses and
complementary business intelligence systems have enabled business to
generate higher amounts of revenue and provide substantial cost
savings.
 According to a 2002 International Data Corporation (IDC) study “The
Financial Impact of Business Analytics”, analytics projects have been
achieving a substantial impact on a business’ financial status.
 Additionally, the study found that business analytics implementations
have generated a median five-year return on investment of 112% with
a mean payback of 1.6 years. Of the businesses included in the
study, 54% have had a return on investment of 101% or more.

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